Series star Morena Baccarin teases the season's final episode.

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Morena Baccarin has a promise for the second season finale of “Homeland”: “It’s a very big finish – would you expect anything less from us?”

Baccarin, who plays Jessica Brody, the long-suffering wife of returned Marine P.O.W., Congressman and still-conflicted potential terrorist Nicholas Brody (Damian Lewis), says the finale episode of the acclaimed Showtime series will be the ideal culmination of a second standout season.

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“It’s really surprising, really, really big and very heartbreaking,” says the actress, who kept any further teases to herself but reflected on the season’s overall arc. “It was an incredibly fast-paced season in the beginning. Towards the middle, it found a little breathing room, and then at the end it gets cranked up again and it just left me dying to know what's going to happen in season three. I keep bugging the writers to tell me. I just want something.”

Although Jessica’s storyline might have seemed at bit backburnered at the outset of Season Two compared to the debut season, her plotline heated up considerably in the last two episodes [SPOILERS ahead if you’re behind on viewing]: in the midst of an increasingly strained relationship with her still loyalty-challenged husband, she resumed her physical relationship with Brody’s best friend Mike Faber (Diego Klattenhoff), her lover during Brody’s missing years in captivity, and as a result finally agreed with Brody that perhaps a definitive split would be for the best.

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Baccarin says the producers gave her enough of an early heads up about Jessica’s eventual arc so she wouldn’t think she was being shuffled to the side. “They're very communicative about what they have coming up,” she says. “I think that they want us all to be happy, of course, but they have a lot of stories that they need to tell, so we always get little bits of information and know what's coming up a little bit throughout the season.”

The season finale of "Homeland" will air Sunday Dec. 16 at 10 p.m. ET on Showtime.